Hi Mark,
The LawnCheck scheduler only supports 8 zones per device . We have had requests to extend to 16 so that one program can manage 16 zones coordinated between 2 controllers, but haven't accomplished this yet.
For now you have to set the schedules for each controller by creating a separate device within LawnCheck for each controller, and then manage the cycle times so only one is on at a time (unless you have excellent water pressure)
Jim